43956687409 has 2 divisors, whose sum is σ = 43956687410. Its totient is φ = 43956687408.

The previous prime is 43956687391. The next prime is 43956687469. The reversal of 43956687409 is 90478665934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28809970225 + 15146717184 = 169735^2 + 123072^2 .

It is a cyclic number.

It is not a de Polignac number, because 43956687409 - 2⁵ = 43956687377 is a prime.

It is a super-3 number, since 3×43956687409³ (a number of 33 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (43956687469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21978343704 + 21978343705.

It is an arithmetic number, because the mean of its divisors is an integer number (21978343705).

Almost surely, 2^43956687409 is an apocalyptic number.

It is an amenable number.

43956687409 is a deficient number, since it is larger than the sum of its proper divisors (1).

43956687409 is an equidigital number, since it uses as much as digits as its factorization.

43956687409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39191040, while the sum is 61.

The spelling of 43956687409 in words is "forty-three billion, nine hundred fifty-six million, six hundred eighty-seven thousand, four hundred nine".